I ran a ASICMINER Pass Through before,
The system works but there are some flaws.

First of there is a lot of manual work, which in turn leads to a lot of errors. I had several times where Transfers that should have been done wasn't done or shares who were suppose to be sent one place were sent somewhere else.
Second a lot of people (several have contacted us being worried about this) are not in control of their payout address, meaning we would have to build a site/routine to safely and securely allow people to switch their payout addresses.

It is just a lot of work and we would rather if we can try to reuse the work put into CMX by the CryptoMex team and use their platform to hold PUs and pay out people, if possible.

As regards to the question about money spent on CMX. No IceDrill money was used to fund CMX, it was funded by the CMX team and external investors.